On Jun 26, 2010, at 6:54 PM, JOHN CARMONNE wrote:
I'm going to replace a display in a 17" G5 iMac 1.83 for a friend. this will be the third one for this machine the first one was done by Apple Care at 30 mos, it lasted 7 mos just long enough to be no warranty. So this will be the third one I was wondering if this is a problem other than the display itself? The displays begin growing lines vertically in wide patches.
Are you certain this is a display issue and not a video card issue? Until recently I was unaware that many iMacs have replaceable video cards. Some do, and many that have replaceable cards have had video cards go bad. I don't know if this exact model has a replaceable video card, but if it does, you should check what type of slot it uses and see if there is an upgrade if you need to replace it.
On a 24" Intel iMac I was able to help someone find a 256MB Geforce 7600GT to replace a bad 128MB Geforce 7300GT and it worked perfectly. I'm not certain your friend's older G5 even has a replaceable video card, or what type is might be, but I do know that vertical stripes can be sometimes be caused by bad video cards or perhaps even a poorly seated video card. Also, poorly seated display cables can cause stripes also, so I'd urge you to be certain the display itself is bad before replacing it, only to find out it was something other than the display.
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